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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LMA7YSP65MDDKP5VGE5OOHGXHRKCSIMG/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "LMA7YSP65MDDKP5VGE5OOHGXHRKCSIMG", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LMA7YSP65MDDKP5VGE5OOHGXHRKCSIMG/", "sender": { "address": "k5oe (a) aol.com", "mailman_id": "aee3209b1433498d8db2ef6ec0d414c3", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/aee3209b1433498d8db2ef6ec0d414c3/emails/" }, "sender_name": "K5OE", "subject": "[amsat-bb] Re: TS2000 ~436.798 MHz Birdie Solution", "date": "2011-11-30T21:07:43Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "\nJohn's solution is also one I have used for years: feeding a separate signal into the receive-only HF input on the TS-2000. I ran this way on AO-40 as well, taking the 2m signal from the atenna-mounted downconverter and running it through a Hamtronics 2m-10m converter to both the TS-2000 and another 10 m rig to independantly monitor the beacon (very handy). Elegant: no relays, and no danger of ever tranmitting into it. I still have the Hamtronics converter, now installed in my truck, so I could work the S-band downink from AO-51 on my FT-100. \n\nFor the birdie problem, I used to be able to tune around it with the big antennas and Landwehr preamp I had at my old QTH (circa 2000-2003). Seriously--if you have enough signal gain, you can tune above it and then below it and overpower the damn thing. My setup is more modest now, so I simply connect an HT for the ocassional AO-27 pass. For SO-50, I find you can tune below the signal and work most of the pass (except when it is approaching you on a high elevation pass). Obviously, you can't use computer control for the receive signal on these two birds. I have had this rig since November of 2000 and found no other serious complaints (except it only has one PC port--but that is another discussion).\n\n73,\nJerry, K5OE\n\n----------------------------------------------------------------------------------\nJohn, K8YSE posted:\n\nAs many of you know, my satellite radio is a TS2000X.\nIf you have visited my satellite webpage, you have seen\nmany recordings of AO-27 and SO50 from AOS to LOS. Most\nof these recordings were made when I was not sitting in\nfront of the radio.\n\nAt first I used a uhf mobile to hear AO-27 and SO-50. The\nproblem was that those radios were not computer controlled\nso you had to tune for the doppler. That worked fine when\nI was in the shack, but it didn't work when I was away. The\nobvious solution was another radio that didn't have the birdie\nproblem, or a simple UHF to 10M downconverter which wouldn't\nhave the birdie problem. Back in the day, UHF and VHF down-\nconverters were very popular because we didn't have a lot of\nDC to Light radios out there. Now these converters are sitting\nin junk boxes and are long forgotten by their owners.\n\nOne of the more popular manufacturers of these inexpensive\ndownconverters was Hamtronics. They made all kinds of stuff\nfor repeaters etc. At first their products were not that great,\nbut they evolved into some better designs including their\nUHF to 10m downconverters. Unfortunately most downconverter\nmanufacturers stopped making them when the devices they were using\nbecame obsolete and unavailable. The use of current production\ndevices required a redesign of their PC boards and since the demand\nwas no longer there, these products were abandoned.\n\nI was fortunate to find a Hamtronics converter on a qrz.com posting\nfrom several years back. It never sold back then and the owner still\nhad it. I purchased it and ran some tests on it against the receiver\nin the TS2000. It turned out that the downconverter had a slightly\nbetter sensitivity than the TS2000!\n\nThe big concern when using a converter or preamp is the fear of\ntransmitting into it and smoking the front end. But the TS2000\nhas an auxiliary antenna jack which is receive only and perfect for\na downconverter output on HF. As Drew mentioned, SatPC32 can\ncompensate for a downconverter and tune the TS2000 for doppler\nin the 10m band. This allowed me to track AO-27 AO-51 and SO-50\nunattended and make all those recordings without any human\nintervention.\n\nA coaxial transfer relay was inserted into the uhf antenna line so\nthat when the converter was in use, the UHF antenna was switched\nto the downconverter input (which outputs to the aux antenna jack\non the TS2000) and the UHF antenna jack on the TS2000 is switched\nto a dummy load. So if you transmit on UHF, power goes into the\ndummy load and all equipment is safe. When I want to transmit on\nUHF (VO-52 and AO-7 mode B), the coax relay switches the UHF antenna\nback to the UHF antenna port on the TS2000. The downconverter is out\nof the antenna circuit at this point. I did not use the downconverter\nwhen operating on FO-29 so the aux antenna jack had to be switched to\nnormal in the tS2000, menu #18 (FO-29 is a linear bird that outputs on\nUHF, currently not working).\n\nEvery owner of a TS2000 that operates satellites needs a UHF to 10M\ndownconverter. Hamtronics is making a VHF to 10M downconverter now.\nIf everyone emailed them to encourage them to make a UHF model, they\nmight just do it. The only other solution is to make one yourself,\nor find a used downconverter or transverter that is gathering dust on\nsomeone's shelf. I now have an IC910H and am doing comparisons against\nthe TS2000. My first impression it that I prefer the TS2000 but that\nmight be because I'm so familiar with it. I use another TS2000 in the\nmobile sat truck but don't have a downconverter for it. I simply use\na uhf mobile for receive on AO-27 and SO-50 since I'm in front of the\nradio and don't run it unattended. I have a coax switch to switch\nthe UHF antenna from the TS2000 to the UHF mobile.\n\nNow that AO-51 is silent, all of the FM operation is on SO-50 and AO-27.\nIf you have a TS2000, you'll want to investigate the use of a downconverter.\n\n73,\nJohn K8YSE\n\n\n", "attachments": [] }